*{
    font-family: 'Poppins', sans-serif;
    margin:0; padding:0;
    box-sizing: border-box;
    outline: none; border:none;
    text-decoration: none;
    text-transform: capitalize;
 }
 body{
        background-color: rgb(255, 179, 64);
    
 }
 .hilight{
  color: #478480;
  color: #ca4701;
  font-weight: bold;
  z-index: 90;
  box-shadow: 0 0 0 5px #ff550080;
}










 .container{
    
    padding:20px;
    max-width: 1200px;
    margin:100px auto;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap:20px;
 }
 .container .main-video-container{
    flex:1 1 700px;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,.1);
    background-color: #fff;
    padding:15px;
 }
 .container .main-video-container .main-video{
    margin-bottom: 7px;
    border-radius: 5px;
    width: 100%;
 }
 .container .main-video-container .main-vid-title{
    font-size: 20px;
    color:#444;
 }
 .container .video-list-container{
    flex:1 1 350px;
    height: 485px;
    overflow-y: scroll;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,.1);
    background-color: #fff;
    padding:15px;
 }
 .container .video-list-container::-webkit-scrollbar{
    width: 10px;
 }
 .container .video-list-container::-webkit-scrollbar-track{
    background-color: #fff;
    border-radius: 5px;
 }
 .container .video-list-container::-webkit-scrollbar-thumb{
    background-color: #444;
    border-radius: 5px;
 }
 .container .video-list-container .list{
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap:15px;
    padding:10px;
    background-color: #eee;
    cursor: pointer;
    border-radius: 5px;
    margin-bottom: 10px;
 }
 .container .video-list-container .list:last-child{
    margin-bottom: 0;
 }
 .container .video-list-container .list.active{
    background-color: #444;
 }
 .container .video-list-container .list.active .list-title{
    color:#fff;
 }
 .container .video-list-container .list .list-video{
    width: 100px;
    border-radius: 5px;
 }
 .container .video-list-container .list .list-title{
    font-size: 17px;
    color:#444;
 }
 @media (max-width:1200px){
    .container{
       margin:0;
    }
 }
 @media (max-width:450px){
    .container .main-video-container .main-vid-title{
       font-size: 15px;
       text-align: center;
    }
    .container .video-list-container .list{
       flex-flow: column;
       gap:10px;
    }
    .container .video-list-container .list .list-video{
       width: 100%;
    }
    .container .video-list-container .list .list-title{
       font-size: 15px;
       text-align: center;
    }
 }


 .smallday{
    background-color:#eee;
    border-radius: 5px;
    text-align: center;
    font-size: 12px;
    padding: 3px;

 }







 






/*原理未明，3d旋转导航栏*/
 .containertop{
    width: 100%;
    height: 70px;
    line-height: 70px;
    top: 0px;
    z-index: 100;
    background-color: rgb(112, 147, 158);
    display: flex;
    position: fixed;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    position: sticky top;
    box-shadow: 0 10px 20px #e7edff;
  }
ult {
	/* 让li水平排列 */
	display: flex;
  justify-content: center;
}

ult li {
  display: inline-flex;
	position: relative;
	/* 取消项目编号 就是小黑点 */
	list-style: none;
	width: 10vh;
	height: 50px;
	/* 让鼠标变成小手 */
	cursor: pointer;
	/* 让子元素保留其3D位置 */
	transform-style: preserve-3d;
	transition: all 1s;
}
ult li:hover {
	transform: rotateX(90deg);
}
ult li:hover div:first-child {
	background-color: #63aba6;
	background-size: 5px 5px;
	background-position: 30px 30px;
	background-image: linear-gradient(
		45deg,
		#6cbdb8 25%,
		rgba(0, 0, 0, 0) 25%,
		rgba(0, 0, 0, 0) 75%,
		#478480 75%,
		#478480
	);
}
ult li div {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	line-height: 50px;
	text-align: center;
	font-size: 20px;
	font-weight: 700;
	color: #fff;
}
ult li div:first-child {
	background-color: #74adaa;
	transform: translateZ(25px);
}
ult li div:last-child {
	background-color: #51938f;
	background-size: 5px 5px;
	background-position: 30px 30px;
	background-image: linear-gradient(
		45deg,
		#478480 25%,
		rgba(0, 0, 0, 0) 25%,
		rgba(0, 0, 0, 0) 75%,
		#478480 75%,
		#478480
	);
	/* 让第二个面往下移动25px 沿着X轴旋转-90度 */
	transform: translateY(25px) rotateX(-90deg);
}


.cantsee{
    height: 100px;
  }















/*流星雨动态背景*/body-1{
    position:fixed;
    z-index: -10;
  font-family: 'Quicksand' sans-serif;

  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100%;
  min-width: 100%;
  background-color: #000;
}
section {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  gap: 2px;
  flex-wrap: wrap;
  overflow: hidden;
}
section::before{
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(#000, rgb(255, 0, 0), #000);
  animation: animate 5s linear infinite;
}
@keyframes animate {
  0%{
    transform: translateY(-100%);
  }
  100%{
    transform: translateY(100%);
  }
}
section span{
  position: relative;
  display: block;
  background-color: #181818;
  width: calc(6.25vw - 2px);
  height: calc(6.25vw - 2px);
  z-index: 2;
  transition: 1.5s;
}
section span:hover{
  background-color: rgb(255, 0, 0);
  transition: 0s;
}
section .signin {
  position: absolute;
  width: 400px;
  background-color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
  border-radius: 4px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  z-index: 1000;
}

section .signin .content {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 40px;
}

section .signin .content h2{
  font-size: 2em;
  color: #0f0;
  text-transform: uppercase;
}

section .signin .content .form{
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 25px;
}
section .signin .content .form .input-box{
  position: relative;
  width: 100%;
}
section .signin .content .form .input-box input{
  position: relative;
  width: 100%;
  background-color: #333;
  border: none;
  outline: none;
  padding: 25px 10px 7.5px;
  border-radius: 4px;
  color: #fff;
  font-size: 1em;
  font-weight: 500;
}
section .signin .content .form .input-box i{
  position: absolute;
  left: 0;
  padding: 15px 10px;
  font-style: normal;
  color: #aaa;
  transition: 0.5s;
  pointer-events: none;
}
.signin .content .form .input-box input:focus ~ i,
.signin .content .form .input-box input:valid ~ i{
  transform: translateY(-7.5px);
  font-size: 0.5em;
  color: #fff;
}
.signin .content .form .links {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: space-between;
}

.signin .content .form .links a{
  color: #fff;
  text-decoration: none;
}
.signin .content .form .links a:last-child{
  color: #0f0;
  font-weight: 600;
}

.signin .content .form .input-box input[type="submit"] {
  padding: 10px;
  background-color: #0f0;
  color: #111;
  font-weight: 600;
  font-size: 1.25em;
  letter-spacing: 0.05em;
  cursor: pointer;
}

@media (max-width: 900px) {
  section span{
    width: calc(10vw - 2px);
    height: calc(10vw - 2px);
  }
}
@media (max-width: 600px) {
  section span{
    width: calc(20vw - 2px);
    height: calc(20vw - 2px);
  }
}